Arduino Secret Door Knock Unlocker
by: Jacob Clarke
Recently I've been making a device that unlocks my front door when a specific rhythm is knocked.
It uses a piezo sensor and a solenoid motor - similar to what's used in car locks.
I've programmed it to learn a new rhythm code at the push of a button and to recognise the rhythm regardless of the knock tempo.
During the day a solar panel outside the door charges the batteries.
I've still got a few technical things to fix up and I'll hopefully make it a lot smaller once it's finalised but for now it's so good not having to put 500 bags of groceries down to open the door.
FYI: I know projects like this already exist but I made and programmed this from scratch
FYI: I know projects like this already exist but I made and programmed this from scratch
